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Letters .Patent No. 77,854, dated May 12 186 8.

IMPROED CONCRETE-@LOGE PRESS.

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TO ALL WHOM IT-MAY CONCERN: l j Be it known that I, LAWSN S.V WARNR., ofChicago, in the county of Cook, and'State of Illinois, haveinvented anewand improved Press for GoncreteBlocks; and- I (1o-hereby declare thatthe following is a full,

clear, andexact description thereof, which will enable'otbers skilled inthe artto make and -use the same, rcfer ,l

ence being had to the accompanying drawings, forming pazt of thisspecification.4 j

Figure l is a sectional view of my machine, the section being takenthrough the line I/gy, fig. 2.1,A

Figure 2 is another sectional view of the same, the section being takenthrough the line :c x, iig: 1.

Similar letters of reference indicate corresponding parts. j. j

This invention relates to the pressing of concrete blocks, so called,which are used for `buhling'puvrposes, and which arelower thancommombrick, diering. also therefrom in character.

It consists of moulds or box'es, which are lled with theconcreteimaterial, together with compound toggle or knee-joint levers,for actuating the follow-bottoms of the moulds upward,'t0 press theconcrete material in a dense parallelopipedon or building-block. V i fi' In the accompanying plate of drawings, the general frame of themachine is sbown'at A. The sidesof the moulds are formed by the stoutblocksb b. The ends of the moulds are formcd'bythaIt portionn'f theframe enclosed between the blocks 6, which latter are?. affixed to thcsaid frame as shown, by bolts, nails, or 4other suitable means.

The follow-bottoms are shown all), the extensions j of which rest upontheyupper ends of the toggle-bars E. These extensionsj are not attachedto the said bars, but merely rest thereon, the bottom of the extensionhaving a semicircular concavit'y,` to t upon the correspond-ingconvexity of thebars, as shown, for the purpose of enabling thefollow-bottoms to be raised after the block is pressed, and thus forcethe bottom ofthe pressed i block even with the top of the moulds forremoval.

The lifting of the'follow-bottoms D to raise the blocks, as abovementioned, is accomplished by the lever l Y K, which has for its fulcrumthe rod g.4 YThe lower endof this lever bifnrcates into two-branches,ZZ, which pass under .the rods a alixed between the extensions.; of thefollow-bottoms, and thus `raise the latter when thc long arm K isdepressed.- l v p A,

The operation of the compound toggle-joint, consisting of'the'togglc-bars E, F, G, and H, pivoted or hinged together :1s-shown ath and m, is obvious; and as the depression of the lever B brings therouudedprojection Li to bear upon thejoint m, and thus bring the s'aidjoint in line with the joints o and h, great power is brought to bearupon the joint h, which latterfin being brought in linewith the shaft Iand follow-bottoms D, exerts a `suiiicient powerl to press theconcrete-material into a dense 4and durable block.-

The bar F is ,not airixed to the shaft I, but works around on it., thelower end of the said bar being concave, to tit on the said shaft.Straps d hold the bar in contact with the shaft. A spring, -S, raisesthc toggle-bars G- and I-I, and thereby lowers the follow-bottoms whenthe power is removed from the hand-lever B. The upper ends of the bars Eare guided to moveV in a vertical line, by means of; pins or'projections p working in slots i in the'frame A, as shown.

, -J is the sliding top, to vclose the mouldswhcn the block is beingcompressed.

In practice, a shaft bearing an eccentric may be employed to act uponthe'joint, mor a number of machines may be'placed ina row, and a singleshaft, bearing an eccentric for each joint, m, may be omployed,'thusaccomplishing the manufacture of concrete-blocks with rapidity.

I claim as new, and desire to` secure by .Letters Patent-' The spring S,in combination with the toggle-bars H, Gr, E, and F, land follow-bottomsD, Vsubstantially as s'hownand described, for the purpose of lowering'the follow-bottoms to their first position, all arranged asv set forth.Y

The above specification of my invention signed by me, this seventeenthday of January, 1868.

- LAWSON s. WARNER.

Witnesses:

WM. H. STICKNEY, JonN J. G-ILMonn.

